There are 11 different objects to choose from including: Crab Nebula, Cat's
Eye/NGC 6543, Cassiopeia A, 3C295, M31, NGC 3603, Cygnus X-3, Chandra Deep Field
North (CDFN), 3C273, Perseus A, and Sagittarius A East. Each object is available
as a 25-piece or 16-piece puzzle.